A plane truss with span length L 5 4.5 m is constructed using cast iron pipes (E 5 170 GPa) with a cross-sectional area of 4500 mm2. The displacement of joint B cannot exceed 2.7 mm. The maximum value of loads P is approximately:
(A) 340 kN
(B) 460 kN
(C) 510 kN
(D) 600 kN
(B) 460 kN
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Sonic Booms: A sonic boom occurs only as an airplane just reaches the speed of sound in air, but not after it increases its speed further.
A. True B. False
A plane has an airspeed of 142 m/s. A 16.0 m/s wind is blowing southward at the same time as the plane is flying. If the velocity of the plane relative to Earth is due east, what is the magnitude of that velocity?
A) 16.2 m/s B) 16.0 m/s C) 158 m/s D) 141 m/s E) 48 m/s
If a radio wave has speed 3.00 × 10^8 m/s and frequency 94.3 MHz, what is its wavelength?
a. 1.59 m b. 2.14 m c. 4.24 m d. 3.18 m e. 6.30 m
If in a double-slit experiment the distance to the screen is increased, which of the following happens to the interference pattern shown on the screen?
A) The minima get closer together. B) The maxima stay at the same position. C) The minima and maxima stay at the same position. D) The maxima get further apart. E) The minima stay at the same position.